MesozoiC and Ccunozoic Geology and PalcBontology. 167 



fresh water types, none of which belong to genera peculiar to the 

 Cretaceous or any older rocks, but all to such as are alike common to 

 the Cretaceous, Tertiary and present epochs, with possibly the excep- 

 tion of Goniobasis, which is not yet certainly known from the 

 Cretaceous. 



7. That, on the one hand, two or three of its species belong to 

 sections or subgenera (Leptesthes and Veloritina) apparently charac- 

 teristic of the Eocene Tertiar}^ of Europe, and are even very closely 

 allied to species of that age found in the Paris basin; while, on the 

 other hand, one species seems to be conspecific with, and two congen- 

 eric with (and closely related specificall}" to) forms found in brack- 

 ish-water beds on the Upper Missouri, containing vertebrate remains 

 most nearly allied to types hitherto deemed characteristic of the 

 Cretaceous. 



8. That one species of Anomia found in it is very similar to a Texas 

 Cretaceous, shell, and perhaps specifically identical with it; while a 

 Vivipaf'us, found in one of the upper beds, is almost certainh^ identi- 

 cal with the V. trochiformis of the fresh-water lignite formation of the 

 Upper Missouri; a formation that has always, and b}^ all authorities, 

 been considered Tertiary. 



9. That the only vertebrate remains yet found in it are those of a 

 large reptilian (occurring in direct association with the Viviparus 

 mentioned above) which, according to Prof. Cope, is a decidedly Cre- 

 taceous t^'pe, being, as he states, a huge Dinosaurian. 



He described from Coalville, Utah, Ostrea soleniscus, Avicula 

 propleura, A. gastrodes, llodiola multilmigera^ now Volsella multi- 

 linigera, Cyrena carletoni, Neritina hellatula^ N. patelliformis^ N. 

 carditoides, N. bannisteri, iV. pisum, JST. pisiformis, Admete rhom- 

 boides, A. subfusiformis, TurriteUa coalvillensis^ T. micronema, T. 

 spironema^ Fusus gabbi, F. utahensis. Turbonilla coalvillensis, Eu- 

 lima chrysalis, F. inconspicua, Melampus antiqims, Valvata nana. 

 P/i^sa carZe^oni'; from the Missouri river ])elow Gallatin Cit^^ Montana, 

 Ostrea anomioides, Corbicula injlexa, Pharella pealei ; from Bear 

 river cit}^, on Sulphur creek, W3'oming, Trapezium micronema^ Corbi- 

 cula oiquilateralis, C. securis, from near Cedar City, Southern Utah, 

 Corbiila nematophora; from the Bitter creek series, at Point of 

 Bocks, W3'oming, Ostrea Wyoming ens is, Corbula tropidophora; from 

 Black Butte Station, Corbicula bannisteri, 3Ielania loyomingensis; 

 and from Rock Spring Station, Central Pacific Railroad, W^'om- 

 ing, Corbula undifera and Goniobasis insculpta. 



